SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65fae8617fb7b685ac7090444c754c714b19ec8b6a3da225db466823ee8d8174' 
  AND token = 'MMuFDgj3zyA1WRNPZ5pnJG5KgW9IG8tUVvZlh5qLW2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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