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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '776fb4766285ef7447def0373d7533c1ab5d6037d156c5ac175097b8f5616914' 
  AND token = 'Z2gQjwE4Apfl76hN66AjRSBya83svy/hs58tUc36cO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00812

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}