SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b77520d4781b1e4cdfac7c36ae6db68bbb6a65965f65e1ec9b2431650910768c' 
  AND token = 'Ppi5ZbPFqoq8ZmWmT/EU/Qvs8fueHZfGC7n+uR+rz8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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