Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00716ff8b58e9eaf424a39715d1e0653f0ff2c6d17e74d59ba0acbc080f8f107' 
  AND token = 'CrzNgiDj3j8PId7xCZ8YZwFbWfOYa2E/1lvnLUpEdis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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