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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c28e06df9ea57b56551fdfefa8834d3ef24ef36a8369b7b23e1ef9236ba2201' 
  AND token = 'PEjNwJsmDpsWQeWNwyUWQPjmHM0f3bDwO1g8DJ7S/mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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