Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd50987311a613a698c29867e5a9fe86243e042a29f87935ca181a2428f8dbe' 
  AND token = '7Rui4ivmnMDYge9Ys8hb9i2CFUYsF+bmPouMjtb8JPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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