SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '37694be64e2332a6e39f1f7c82cadbbbbc82e8f864cf14202ed7153e78307e47' 
  AND token = 'FwzJKUOywBe7hReTSuHK5WYj1I05YK7XgChFhX0sWvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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