current_timestamp(3)
2018-09-20 17:56:39.916
unix_timestamp(current_timestamp(3))
1537437399.934
select REPLACE(unix_timestamp(current_timestamp(3)),'.','');
1537437399953

并不很精确、可以用用
附上时间戳转换地址
时间戳转换地址
https://tool.lu/timestamp

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