Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbbcd561f47c2ca60d1ef0d321c7bd7f95e0e8ce1e83ba2acd988bf647d292f' 
  AND token = 'jhDxFyk90deZFGy2kr4k1ZC4hebgCDjEYeBzJG0sr8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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