Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f52ce390db8965c9bb9796680e74e1972e35d1fba2733f04de527dd27a79c3a' 
  AND token = 'BrUaWHBgvLmFuYs400XQ/tQUIlWsKkAfOUxQ5483moo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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