Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d59e5861561416b07aefacea3b330ba260bb8dffe446584486704daafcc20bb' 
  AND token = 'ekM1WIH3ltG/ywviODjt/CdKLreOog5l97i9Dlmo6yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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