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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '86f39a6b8fabe52b0b1e8754522d225c69208ebfa18df12393508474b1713787' 
  AND token = 'WbZAP2RgF879Wv0e2F2K0ZDXVS8/Zec+ZvRlXJ8xgAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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