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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a0954b94ae5280b0872aee755927175e1d564e52814560628245b2200693e9f0' 
  AND token = 'xurBF1Wm+9hTbgIc5nOgj5o4j9KNjyqZTwUrK9MaWR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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