Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801e92e77cd490644ff90c7f9088b9e40c0e0c9450b19d84c7cca5386a044e88' 
  AND token = 'T4FCvGb0oqvdFbDRQpRt6WskhZaBoE6a07U2KQ+Ph2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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