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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4dfef8220e137c368f86bbc2af19f3966de0a13dcfaf3ff61a6a92b400e11863' 
  AND token = 'LoN/Gbau6lODh44rqtPM4jcwhSlr8db2+Qv+D6I/beg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}