Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ab6024574289d6ad7798eb9ebf2924d75f2377c7c6d67338d1cb7981635f93' 
  AND token = 'UxA+VE+WDpeVSNf4BSFwAjA/Fcg7ighQ7gpF7zydaNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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