Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4038ad670312f72598b30d5f3abeabde6c7c67a5b8702c6777aa9c0ded6c9183' 
  AND token = '4j6uqh4Kp6jIZxM+TdK2u9TSYGmuyat8ctYL6mJjog4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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