SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '272e3cce2ed43aa0d0f72b853084e42cc9b7391e495b42e75d995e8e5a67b598' 
  AND token = 'sYlwvwXECn6VggPyyGAEt+WM+PxNKmhLPR98CMSOOk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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