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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '63744e897b8d684038cc3cf35db815d51728c864f79c6505d6c046438b574e0d' 
  AND token = 'JvDFA+eBY39UVS0EEZj9XQkekGM2cmZCHXy1eDQ9bws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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