SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a6c3b37c67f97b1076ebfa654b9fd220fa792916efcaa7e61247c219dde1e84' 
  AND token = 'jcxrvsS8hfIaG4LQQwGJKZs2u7rtiB5YVBwnRWncBcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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