Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbc714df0b27a03dea33c4237333beee25ee486deb0573c5d1acfa445a622db' 
  AND token = 'cD/jikj5CzmEzmwjRuv3IegOLu1QJzsEIWo1V6t/YBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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