Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f57ae99cf4ece55bbe3cd150ab892034dd80ae367e03d7acf0b144b28cf2602' 
  AND token = 'Zg9q0ZA5eG/dwcQUExYaHe3UkpXyP1My+Wus8GW7cNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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