Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575ba1f018b8de3ec033b3a4b8fba7ee65234865a29d85df9a13382ce1ee4bab' 
  AND token = 'q2WNW19DrIiUnvlzxMnqy0pHY/6F+YbCB0qSWW8COdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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