SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a94e050c1fbe94111b7783c2d85b925b136d0cf6f1ce8b24d067a217e59e07df' 
  AND token = 'wh9IZOfk+P6frfpq2ZDHoEdBltXKVmsSEOCZggYm9fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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