Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daadaea547609477a8fab121950a77a871f77ea9eead4bc0044bc38861e96411' 
  AND token = 'TgTXpiQA2Hr454OuuecXEys2qVBRAefvTJyJOff2TIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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