Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1a5c3036aefe85e8a421b9c561b181c8c49f58625068215c72d16eb9fc9e55' 
  AND token = '0ih6alnvoLvUUJCBvuMS5cD7rTBt7MQArE+MI2dnWT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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