redis 过期时间
EXPIRE | Docs https://redis.io/docs/latest/commands/expire/
The EXPIRE command supports a set of options:
NX-- Set expiry only when the key has no expiryXX-- Set expiry only when the key has an existing expiryGT-- Set expiry only when the new expiry is greater than current oneLT-- Set expiry only when the new expiry is less than current one
A non-volatile key is treated as an infinite TTL for the purpose of GT and LT. The GT, LT and NX options are mutually exclusive.
