Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65e2e8f15678ef6f246bbf3962e46a6bd300da29f8d6f6a35af2263371e55c2' 
  AND token = 'QcDlMN/xPtoqJ6IJ9DhwWsVptC5NuIdHLWdUC1xG9lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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