Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd53f196bbd12f897df89b0f18fecc6116d799c560f7479e778ce1ed44bd142' 
  AND token = '8EkDpwUpJL/LYEXnIkjnMrCf8KxyUB82dnvZvSmX5K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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