SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '21f3adbde8a10e48add0ec2506fef695cb02afdbe5142063fd7913465761f8b5' 
  AND token = 's/RmerwP0hk7v8vLVfgkerwCK5iOBfJG9Fyt0XMhOW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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