Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f52c738566b00a3a19f3daa8c30242e640756d3fbdc970ae9ea40060020fed' 
  AND token = '0nvgLNTGKjG5UE9LnNX93cPsAZCXwqvKnOtxNkEnD6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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