Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd618f924c7e444b46934f00200d336be33a4dd3c828a37b66df5ea51ca314500' 
  AND token = 'pMLXqs02opNW5RuLvLs3SCw+SR6rykQBwoyRhVOIbF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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