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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03123789ef8693a918eb4ce06dfa36b9c4b9a7f3918e4dbb6f51af1512b56900' 
  AND token = 'eTAQgLbAFb5JJeSbsGvQaJHv5btNAP8rVNq5iobPN6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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