Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abb68936bd7c1a158d8d216c9bacdf0115d8de98f04d0e67dd4038443d82709' 
  AND token = 'u1wVWDWFCJzWfPZgxpfAuctv0op7pZcXJj3b1zCjn7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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