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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba9d42eda8b1c6bfd42766795f25bc12b247ac9c9cc8407050ba984381042e6a' 
  AND token = 'FKearufqG58T7D6gfdshYmLkUdftKcw2Qm/zhe7qHBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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