Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2019818963714f02797ef243137149541c3eb4fd3f036d393cc643e8c6aa2d3' 
  AND token = 'bSVuWKWmd9WiXzthN24ayURe6xID0eBkM2K4I89wUJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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