Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123d908aa5535496c3418afbecd379839fb4d669e08c702027dc36372e377531' 
  AND token = '1GH4Z8M0mxDqiYOa2EcuSgf0kA8MrxFmo4OcCLa958o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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