Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b4f1100e2e5fc556eb0f98eb73bcc757d33ffbb7d52a9ec5d21d92aef43749' 
  AND token = '+hUe0etvN1mcCnLrwVaXrDvDzp75x455tV60zMVd8Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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