Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ddf3499f7f116b16831c06bbfbbfc44b459788dad73e5e4ae43e8abc0dacab' 
  AND token = '4tt+7BOUpXb4VHyJT3RhkQ5FLtVjfgja8RDonRsj1BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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