Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5a504b7f6fd0ccf3c4df57255fdae0d57629700d6b00cdb88593187421b100af' 
  AND token = 'IDINLsYrarvr+V8xsXWGpIE4cREkUKLmqxIb22Qq+xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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