Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4b38d0c76001d94ab23a4005d4b81a255264b3d5b7464c3aa2b7ad1c0ce6ff' 
  AND token = 'f7KjitYUWC7hL995HYWLSYjDaQIBkcYchUyKUYbYU0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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