SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72fb2d8d1b75b474bd114dd51430a5d7f59fff6f73ee3bcd18230c044b37ec4f' 
  AND token = 'w0V3hGeaDAygfvXv/nzRqAHXI3idqXjLS2wOiP77kVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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