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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af2257c2689e00cbd401b78e5848050c741968e8fb1109e853233d135f2118b4' 
  AND token = '7PJznwLlAoq1o+XC8olpVoIDdu3AyyY4yROfD1xH2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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