Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ee842c0a56770edab9e26b7ef412bb560b3c2c76a3d1d34afb45bae4f395d3' 
  AND token = 'R/WgUje+WnYueHHYCgskXvMqwXm6wNWYoSdYIyV5QnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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