SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76735208e2054ea862f4778c0aa67a873c2d0c00db772ce591778d2c2dc80389' 
  AND token = 'vhdI4X4HqQ3+Q3QDI5u7NKLXLcRbBVkzjb/XhgzCWJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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