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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9197660e44382eb28bddbd3ca4c4477c24b4959ea0cd2c76111a0af099a20f1b' 
  AND token = '1QKMUaSTkIaQB4zh3e4QpSan5K7GHsaHdIZ46eSJf+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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