Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af39a7cb83c0a44c4091d407db5ec9e906803c6b47c5d78ad74b14b089a70705' 
  AND token = 'gqzcxOFumuinhOsK8XMLSWoO/Gy9cH8ZmleT+9kvzvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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