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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e317dbd7f82d0ea587d0bb56e14bfd86e71cca21844d38bd3c160b79cdc47e6' 
  AND token = 'pZ5PbadgWS4bX62Kppu7n4tU0IE3D+gnxsPdUXZGBJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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