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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b176fb31cc4518c1d619e76d6e820158f17a565d2b8d22593146ba25d075cb4' 
  AND token = 'QlzjhatcnewuYIExb6ozJYuc0YD+Cyr9q6wdN5Nemcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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