Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dc2bb15a94415dbfad68626c8a19e3c814406a5e4bf21bf3370ab9f69b9ccc' 
  AND token = 'RzH0/kunuInDhkcerl76B9b44qVjsqJtB48ShlmdpeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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