Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad540ed1d44ee9adeb376746204eb3faecbe02a5786aeb016c792869adfa27c' 
  AND token = '97g+Kr1X+hQMydRS4amLM+cpXd9NP+qethV/oHVvxkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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