Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0dcda04fb2fcc0f973740b351081b88b04ba3bcf6d1be2b3e486ef990a7945' 
  AND token = '998s+cFuvMsPAijhYLwoyoyhbvjR80Au8TGtYBGGPqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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