Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d73eff739520455920f640bee65f958288f73f88eee22cd45c5bd4474f1b038' 
  AND token = 'URRkQOIbsmsaYps29IH+lW3BCCklDwuVyc2GHz4MWrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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