Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559d5ad2d6b0a78a5fee66153d6dd8156d1d1cf14f062e64c8110a3335aedcf9' 
  AND token = 'U1G+T+4jdgn/TUfO3V4JZuTe537EjBs0WYG7zu9lh7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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