Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbd4b9dbe685fe31ed12aba8d3d43e5a4812b616fc82167ad2a2ccdbd01e790' 
  AND token = 'BgWyEXTOWPVcB6f0Ju28jX1AasPqYQxQHNAqyirnRS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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