Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9939984ebd19e96ed706fde9aa2628f3e22a8a9998423b3fc25f0bfd8091b30e' 
  AND token = 'o8SloP5+sP+wJMmbwoHpE6ICmK6gAsxEko/zXvdsuD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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