SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc363f0dace82446fdbfe369071004f96873825c2870e933c2ba03e105a27e8b' 
  AND token = 'qP5aw0VXhDzsu+k8VFCpQXTtsc2Vhg62s1sLBR3iS2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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