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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd89d4a416ed2601c005df3d19d40971e846fd4d268ed0d6e94c77109bd44adc2' 
  AND token = '9RYXEkPee+BV74A3ARBbrFdy4VZSla7WXNtv/quRWXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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