Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71616d1c306d048bb26381cd0e951aac8bf864d4bd5a30545334a3a850863209' 
  AND token = '0qHq8LZaqBeVWg367+ApriQOGy0eKihpfMUVKOl/FNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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