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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '81f3f17ce7c44994afa4b301df4b7ca20157ffb0bf0424a5a7db4a2926daff21' 
  AND token = '2Lt92Tg5CnkBs7gcPj9oUjGZbVCWo98KWB0UVBIy/L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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