Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd6d5070c287535020e1bd7d10a74bd821ef7428f26a1d089bf33e4248b7354ab' 
  AND token = 'GJ/N5vO64AEXGt7t+5lnZ6MV62kXasemaYeY+ate2dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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