SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '809fe9dd1ab07f7b4db1bf25dd8256a3106f2ed2f646b89f19cf0abd1f718201' 
  AND token = 'pYN2lwoXWHFmirmmvbfZmjGqBxb4xOfJkRKwgpvOxug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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