Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf23a5eda1a0b2e0e79ff3f2bcc16823a420fb9b62f515eec0463a33e66aac1' 
  AND token = 'bE52WpD8pHEZYspWionzmOmeXdlGz+BELe1W/TapUwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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