Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5d0ab1003aee4f647d248444556179b9bfd0def6bad2d15abf8409638edffb' 
  AND token = '9fJ/eIj8M7jYwQz3aEIJRofO7RsnrFIZQzqo+xUJcYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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