Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c89cc2c9d234ff4e8bca412d11fd5d67045aab4b197d9f8ca5087b78d1d69c' 
  AND token = 'MYieivAPkbN5iWE57rpgKcT5qGsDZAlTxFf+4AQWtpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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