Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b8c1d152792db91b17b79a000c76051be326daeb501698bfccb43b71e54a79' 
  AND token = 'JQquOK1exFVTfZkFDsRlbgblgk2P0hWFvcX2gcoovss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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