Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e9238692a51e54e77f5202f9a69944d8f9c7473a42846789118f015a228902' 
  AND token = '1EzYJSc9bcBKh5Vhcx/J/J0N4CAlT58sQeCUr2uk+Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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