Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d318555312ab9a8079f4950cb645e7f38d430cdc2ab98829ce5cc7a99a8b01c' 
  AND token = '76gOIDV1KMs9Ldc8zeiGVaYqtd7C+61D+gnE9qi6QGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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