Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38896ef8d3b9ee6d0c0c4020b6040e1fbe14c8d3d0d44193723f54cbdcecce72' 
  AND token = 'm5toViVozJ+6/0ZARRY3Yk4ZApY9vGsPJTHUOrQAyfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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