Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b0c1f0d09aa7b3383bdc5f0690aa387a6db45cd4416cd9fae589af43e1e3c9' 
  AND token = 'I8VeqTekMlJal0TTrToqZqq3+75y4wH5fsFLKAZCbA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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