Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5559554100ff05d1a7524ba82ef1b5ec607c97779a50a2d9252d8ad46a3ccda7' 
  AND token = 'twn3oAvf1CIDSeFqyuOo4nYCf5mUiG/iWhnjnDnnEys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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