SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e3ff56a4965e7405c706473cd085e011bfff1474a9452b8e1e12c249b194cf20' 
  AND token = 'P9TmIxoHs8VVDsn6dAJpgX1utfe7vBtYOqC+62+MKX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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