Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783065248b47f1e3ab0a32ef6cbf9dd57d7843a6acd1ff3e9be7dd09cf6d99d4' 
  AND token = 'mL/Ckb1d0Xuq/WcS4iOGkpaTmkGB+Bl0Z6sEGjpAMWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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