Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939a36c1185c90c6dcb3fb914fa47c1fe895c198940dbe048400b05249d28bae' 
  AND token = 'df/Rp4HJzayGs3F6U+PVuAzHhPTQlTW6nkxpVG/+wyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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