Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b3362cf865dc006b5eca7faf0a361c256d684a4c16fcd8431a74ee7a678838' 
  AND token = 'CZSwIcxJHzXdjBF0mM6MXQkg8eZcmfMiP0CIzZqvWTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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