SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a39175f90334844a26f87d4e7216070eb23380e6d832898fbf75c30011c3005' 
  AND token = 'Gs30CQGgKlPA+aB0RtoDXaVyvRU1Ou4fl+9fO1ZomnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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