Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f7c0ff1eb84e02de6a44b2ec6f60bf8eb823bccdcd300fb94e03a73dee0d6a' 
  AND token = 'GLHr7VevrxmoIFtcLp30sc0h9/a5YK/Du2OTwjpmPtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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