Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3dbd65b6257124d3b0ed60056142a1e215a57e54a9f116af39e7d651c7a7bb9' 
  AND token = 'kZEiHUTozWipcVZZYmfYqWcW7fMBr4f8kV8jPxf/EyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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