Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ed3b84e19ee0c73adbbbb58c09d1ef98a0d379fee83caa70a3aab024957c0b' 
  AND token = '9v5FlWIQ9ADOz1x2Zb4mdriFGNF0bCMilBF0ERJWi1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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