Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f67a800358404505473ee24aab75fe4e755dc0e3f380a9adfc5aa94defa0b4' 
  AND token = 'x8zwrfvUnO8Y8Ww4uHzb6GY0SgMXGGXlzvM9mnEjelk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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