Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9273e6cf8eb983f5c8fef89386e4b5818b85f16aa99f94d7eac93a00fbb99af1' 
  AND token = 'zs5UQXHVr3txaaxQwPPeWcW6Bu+s0+8jEB1MZ8E7FJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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