Skip expired_time when not needed

[javeme]

improve #794
Change-Id: Ic607b372ba61ac5768b81497d4ae7b2d4f4342f4

[codecov]

Codecov Report

Merging #1044 into master will increase coverage by 0.52%.
The diff coverage is 81.69%.

@@             Coverage Diff              @@
##             master    #1044      +/-   ##
============================================
+ Coverage     68.58%   69.10%   +0.52%     
- Complexity     5401     5430      +29     
============================================
  Files           329      329              
  Lines         26394    26407      +13     
  Branches       3761     3773      +12     
============================================
+ Hits          18102    18249     +147     
+ Misses         6512     6369     -143     
- Partials       1780     1789       +9     

Impacted Files	Coverage Δ	Complexity Δ
...graph/backend/store/cassandra/CassandraTables.java	88.14% <0.00%> (ø)	3.00 <0.00> (ø)
.../java/com/baidu/hugegraph/auth/HugePermission.java	73.68% <0.00%> (+3.68%)	6.00 <0.00> (ø)
.../baidu/hugegraph/backend/tx/SchemaTransaction.java	91.54% <ø> (-0.05%)	70.00 <0.00> (ø)
...baidu/hugegraph/plugin/HugeGraphGremlinPlugin.java	86.66% <ø> (ø)	4.00 <0.00> (ø)
...du/hugegraph/traversal/optimize/TraversalUtil.java	59.17% <ø> (ø)	118.00 <0.00> (ø)
...egraph/backend/store/cassandra/CassandraTable.java	80.14% <75.00%> (-0.15%)	84.00 <0.00> (+1.00)	⬇️
.../hugegraph/backend/serializer/TableSerializer.java	87.90% <77.77%> (-0.48%)	61.00 <0.00> (+2.00)	⬇️
...egraph/backend/store/mysql/MysqlEntryIterator.java	79.01% <80.00%> (-0.48%)	20.00 <4.00> (+1.00)	⬇️
...aidu/hugegraph/backend/store/mysql/MysqlTable.java	81.54% <90.90%> (+1.76%)	96.00 <5.00> (+4.00)
...hugegraph/backend/serializer/BinarySerializer.java	85.41% <100.00%> (-0.03%)	119.00 <0.00> (-1.00)
... and 11 more

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