SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd86accf270549a9201d601684e7ab6fc77ba4d9d6ee4551e987dc98c08f91fd' 
  AND token = 'QcdhVAjKZzvwzW8WIqYQWlGykI11/HCn/HejZlBS2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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