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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af063e1c9744ac02f1cbd06edb458794c851d9e4cc19aaa58adc96d973aa2b51' 
  AND token = 'jeERxKV9gjnn1UiJrVh7CHFoXmJjplA0SqJnrtGf6d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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