Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2fa0a7a5e21eb0d10cbfb8098bf6e85efeacdd9bd6744ae68b348fc4dcfa14' 
  AND token = 'rX9V0QGzu4BrsJVFAhEW71u9NRR3VxgrMxUjrrwDioI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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