Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c76c5484f625aa088be2f711a133d9420cfa56231d0caf08e579ed0e373f5f' 
  AND token = 'D1iWNL9bcTKzHcmWXi9YAQALUHITstZcJ3sqra/VEac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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