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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57cd20e02d920896f0350616041cb6f037ddb0613b992c56ab9f999205e90c91' 
  AND token = '42TdFE4IyKryB/7qIVo7R9qSTuq+DI3pc+pd2QH8xqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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