Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac0da2aacebb92c56861d065e9691eeae70f47942968371cf0d3a5b747b4ffa' 
  AND token = 'aZEd3gJoFpGdGWP/k4sQ9uTv9EO0k6kp+zjcjlEI92M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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