Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcc9f036b4465db073a3a105a9490cef45dee6f6b9e21467e245b9a7e997549' 
  AND token = '6NonLTu5px2ra5TMCAvxWG0qZEelELegbPb8LAQf7qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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