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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2a77638f01f21945635742a76231db3b8e24d0771c2ebff5fee9f001d40c80e9' 
  AND token = 'wcp30fPN85yHqfHZr0lVN4vaWeTG54cASqn2FE318UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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