Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7709daf1f5f5ba2a35b76136df6f0a3ac501325e7bb0f715ee5e62621174111' 
  AND token = '8qtVGa5+F0I2yMsy+pcAo2XadDhORgH1uZYOwbFG+Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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