Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a3fb57261cf1f26281b38c998974a8e3b3379c5749feaf1fc2684db56a58f8' 
  AND token = 'hF5MlwA3ixfo3DitSzR8hbStIoFl4gIbk9e+bQYFl1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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