SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf4cd8f4bd32e5de2dc1a360afed3a3ac50553e3b5ba5da8e8fec7aca291d776' 
  AND token = 'ojFKePeRQZUB3uzm+QhE7LGXyVsJrxuW/HrABZw/EKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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