Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36c392b3c61a55388af1a2461d45bb9ce1cbe3eba6db1c7c1c155b3628b8aa4' 
  AND token = 'Fzgz2P0PG5a/jvztBDQ/seM7jmEoxOn+sRS1KbreYJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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