Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac9e52cf258b66142d7971747024315a16d0f880a548291116ebcc525488e9b' 
  AND token = '3XVaWsL6qZMNNSqh9GWeKJ23zDDh5xzlasIVTrFG7cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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