Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c5199fa588e963a395b57545dfb9a924da25d4a8c0a869dbb8874ad7a58ce3' 
  AND token = '9ud4B/kYOGy0QSkIEQga+tsf0WmeOD5a4PxHkxrtiMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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