Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e131a313a6993a50ce158dc5270ca6ebc148a24e9e7c59ea3b47361acd83358' 
  AND token = '+bJyd0jd19Ff9hPVFH88AKU+heN7pe3U7WMrnzQiUVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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