Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c7985cc9f82bc268ff104062829007647a3a4a99ae695fcd2f147081de88ea' 
  AND token = 'dvvDkOpb14LWgyDOxNjB64bWldvGOnbNoS5Xb3TfzdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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