Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3b9cb34f20e960d52e9e0f532cbb4e7230a9c845f392ecfe2ea4ee0033f36a' 
  AND token = '1jpqlJD8UH9dx2BcfiPKhZaFD9zXIV9F9B2FcerVgzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00200

JSON explain

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