Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e921b4fd8792d649d2ec5abc2baac77091b5f341fa633e498aaefe9bda2103' 
  AND token = 'lv9hq5YqfQbp5TvjxXbh9aoVCzMT9Y5hFmY50EPqtBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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