Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a50d62e2241fe6c187c8c70ba8ed08b50713981176276c2c54c27a90ab90c33' 
  AND token = 'j1Q0jUQLkwkfm1qRyxkWHUu3fwbl/jIVqFiGKy12xhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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