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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '35ef1479e9ca46746d7296390c60d71056b96d79e9299e61d6868f4be3499e8b' 
  AND token = 'p8Ac6shcv/nqriFuTtZWYExAdpNxz1xIxeYT6wfnl9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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