Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787be02d32f45e2e6d2cb3578e08b59e822978e07f5c766c589b87f56e9830b6' 
  AND token = 'Pg4hJWo3htQpawijbiDlLRvn/rzPMeprdsvopzQtSFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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