Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2329d249d361590152084a01ec13b383336176b093f3043999be8002dca7eb18' 
  AND token = 'mzwZq83+uGe/giNWixsqe5eLayjr8fb06RArD2BAPS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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