Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704c3a3ca7758f1f059f575343fbbbfb2ee070f96dd16f99d9e80cb6d84303ed' 
  AND token = 'HT/TgfFjgb28Y/RoZGOSaD3qbUpUX9GlAsmDfNJRb6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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