Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b36f91c7b0e40abd017b39c7a7cdbc372d77a3b069980cb1f6725c24255df89' 
  AND token = 'slkOJ4gT12CQ9tscXf9NzitWtRAI8WJe9AqpUSgIpGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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