SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d6f0c463c84f3aa3cd8ae29796b94fce66df417e97f161e2257159ba7e86655' 
  AND token = 'T/31mfzjc68YqB8ubIkXNVOaVjI7WrqfHtR0RJ0jgGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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