Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b0993a78eedb6ffb95f51d242b5e207d616a01fcefb518d0a3c95006c01e0f' 
  AND token = 'mzh4ZmZ4aA3spyJymWIFQCtFkWWarpkiju6cRb05uyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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