Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9f55afd7e6df004e47caa326765e870740d5375ce006b63be1495bde153bcd' 
  AND token = 'gNwuHMXY9bcFjWcAlG1/7uvVmxoDvZE6TBpWN+jCllk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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